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====== Channel Bonding to share the same IP for Bridged wired & Wireless interfaces ====== This is a variation of [[linux:bonding]], it replaces the wired interface with a bridged interface. I use this to run kvm, hence I've included the configuration items to bring up a virtual network device (TAP) that can be used by virtual machines to integrate seamlessly with the actual LAN. Currently only written for Debian systems. FIXME: This seems to fail in bringing the bridge up automatically and hence you'll need to set it up and run the dhcp client manually after setup ===== Debian-style ===== In Debian this can be achieved directly through ''/etc/network/interfaces'': <code> allow-hotplug bond0 # or "auto bond0" iface bond0 inet dhcp bond-primary br0 bond-slaves br0 wlan1 bond-mode active-backup # or bond-mode 1 bond-miimon 150 pre-up ifconfig bond0 hw ether 00:11:22:33:44:55 pre-up ifconfig eth1 promisc post-down ifconfig eth1 -promisc pre-up brctl addbr br0 # Create bridge pre-up ip link set eth1 up # Bring eth1 up pre-up ip link set br0 up # Bring br0 up [NOTE: FAILS silently] post-up ip link set br0 address 00:11:22:33:44:55 # Set br0's MAC to ours instead of a random one. TODO: Doesn't seem to work either post-down ip link set br0 down # Bring br0 down post-down brctl delbr br0 # Remove bridge allow-bond0 wlan1 #allow-hotplug wlan1 iface wlan1 inet manual bond-master bond0 bond-primary eth1 bond-mode active-backup bond-miimon 150 # Usually optional: set wlan1 as active temporarily, tell wpa_supplicant to use bond0 #bond-give-a-chance 10 #wpa-bridge bond0 # # Single Wireless location/access point: #wpa-ssid "#MY SSID#" #wpa-psk #MY KEY# # Multiple wireless locations wpa-roam /etc/wpa_supplicant/wpa-roam.conf # And set-up wpa-roam.conf with SSIDs and Keys auto eth1 iface eth1 inet manual allow-bond0 br0 iface br0 inet manual bond-primary br0 bond-master bond0 bridge_ports eth1 tap0 bridge_stp off bridge_fd 0 bridge_maxwait 0 # Set up a TAP interface as tap0 pre-up ip tuntap add dev tap0 mode tap user root pre-up ip link set tap0 up post-down ip link set tap0 down post-down ip tuntap del dev tap0 mode tap </code> Enable with: <code># ifup bond0 # This fails to bring br0 up and hence DHCP will fail # ifconfig br0 up # dhclient -v br0</code> With cable connected, ''eth1'' is used. Without, ''wlan1'' is used. \\ See status with ''$ cat /proc/net/bonding/bond0'': <code> Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011) Bonding Mode: fault-tolerance (active-backup) Primary Slave: br0 (primary_reselect always) Currently Active Slave: br0 MII Status: up MII Polling Interval (ms): 150 Up Delay (ms): 0 Down Delay (ms): 0 Slave Interface: wlan1 MII Status: down Speed: Unknown Duplex: Unknown Link Failure Count: 0 Permanent HW addr: 00:11:22:33:44:55 Slave queue ID: 0 Slave Interface: br0 MII Status: up Speed: Unknown Duplex: Unknown Link Failure Count: 0 Permanent HW addr: 00:aa:bb:cc:dd:ee Slave queue ID: 0 </code>